Heel drilling machine



June 30, 1931.

F. E. BERTRAND HEEL DRILLING MACHINE Filed Jan. 9. 1929 Patented June30, 1931 UNITED STATES PATENT orrlea FREDERIC E. BERTRAND, OF LYNN,MASSACHUSETTS, ASSIGNQR T0 UNITED SHOE MACHINERY COBPORATIQN, OFPATEBSON, NEE/V JERSEY, A CQBEQRATION OF HEW JERSEY HEEL DRILLING MACHINE Application filed. January 9, 1929. Serial No. 331,375.

This invention relates to drilling machines and is illustrated asapplied to a drilling machine of the type employed to drill through theheel seat of a shoe into a heel which has been applied to the shoe. 7

A machine of the type referred to is described and claimed in mycopending application Serial No. 5d,0 16, filed Sept. 2, 1925, Patent1,722,992, issued August 6, 1929, and the present invention is hereinillustrated as embodied in an attachment for that machine.

Machines of this kind are provided with a drill which is adapted to befed manually downward through a previously formed guide hole in a lastupon which the shoe is mounted and to drill through the heel seat of theshoe and into the heel a hole for the reception of a screw fastenerwhich is later to be inserted and tightened for the purpose of clampingand holding the last, shoe and heel tightly together. It is essentialthat the fastener receiving hole be drilled deeply enough into the heelto permit the fastener to be screwed far enough into the heel to holdthe latter securely and it'is equally important that the hole shall notbe deep enough to weaken the heel materially or to approach too closelyto any of the surfaces of the heel.

Inasmuch as the drill enters the work at the bottom ofa deep guide holein the last and the place on the work where the hole is to be drilled isentirely concealed from view,

it is impossible to determine by inspection how the drilling of the holeis progressing,

; and the use of any depth gage dependent upon co-operation with thework makes is necessary for the operator to rely upon his sense of touchto determine when the hole is finished. It will, therefore, be realizedthat a problem of substantial dilficulty is presented.

This problem was satisfactorily solved by the invention disclosed andclaimed in my copending application, Serial No. 245,966, filed January11, 1928, Patent 1,748,059, issued February 25, 1930, as long as thework supporting table of the drilling machine was vertically stationarybut, inasmuch as the depth to which the drill penetrated the work wasdetermined by a stop supported on a vertically stationary part of themachine complications developed when the work supporting table was madevertically adjustable in accordance with the invention disclosed andclaimed in my cop-ending application Serial No. 127,03i, filed August 4,1926, Patent 1,7 57,163, issued May 6, 1930. In that case a change inthe vertical position of the work supporting table made necessary acorrespond- ,ing change in the adjustment of the drill stop and a singleseries of indicia upon the adjusting device for the latter could notcorrectly indicate the proper setting for the drilling of holes ofuniform depths with different adj ustments of the work supporting table.

It is an object of the present invention to provide in a heel drillingmachine improved means for positively and definitely determining thepoint to which the hole shall be drilled in the work by engagement withthe work supporting element of the machine, regardless of the verticalposition of said work supporting element when the hole is being drilled.

lVith this objectin view an important feature of the invention consistsin the provi sion of an improved depth gage co-operating with the worksupport to prevent feeding movement of the drill past a predeterminedpoint in the work and comprising a carrier, a gage member slidable insaid carrier, means for securing the gage member in various definitepositions of adjustment in the carrier, and additional means forresisting movement of the gage member through the carrier sufficientlyto prevent said member from dropping when the securing means isreleased. The securing means may advantageously comprise spaced teethupon the gage member and a co-operating hook upon the carrier arrangedto engage any one of said teeth to secure the gage in any of saidvarious definite positions. In the illustrated machine the gage carrieris secured in fixed longitudinal relation to the drill holder, as by aclamp, and, therefore, moves with the holder and the drill.

Invention is also to be recognized in the illustrated embodiment ofmeans for resist ing movement of the gage member through the carrier,comprising a continuously etfective, yielding friction device operatingautomatically upon the gage member with sufficient force to prevent itsweight from causing it to move in its holder.

These and other features of the invention and the benefits gained by itsuse will be better understood and appreciated from the followingdetailed description of a good practical embodiment thereof, when readin connection with the accompanying drawings, in which Fig. 1 is a viewin front elevation of a structure embodying the invention, showing theaction of the depth gage when the drill has penetrated to the desiredpoint in the work;

Fig. 2 is a similar view illustrating the means for facilitating thesetting of the drill in its holder; and

Fig. 3 is av perspective view of the drill point engaging anvil.

Referring now to the drawings, 10 indicates the manually operable drillholder of a machine such for example as that disclosed in my applicationSerial No. 54,046 hereinbeforereferred to. The holder 10 is providedwith a rotating chuck: 12 in which the drill 14 is secured by a setscrew 16. By loosening the set screw 16 the drill may be ad- I justedvertically in the chuck to determine the depth-to which the drill willpenetrate the work, as will presently be more fully explained.

The surface of the tread plate of a work support upon which a lastedshoe 18 and a heel 20 are sustained is indicated at 22. This worksupport may either be stationary or vertically movable, since the depthto which the drill may penetrate is accurately predetermined entirelyindependently of the position of the work support, and tie dril which isrotated continuously, is inserted through a guide hole in the last 24which is in the shoe and fed downward through the heel seat of the shoeinto the heel, as shown in Fig. 1.

In order accurately to determine the depth to which the drill 14 shallpenetrate the heel there is provided a gage carrier 26 having a clampingcollar 28 by means of which it may be securely attached to the drillholder 10 by tightening a clamping screw 30.

The carrier 26 has formed in it a guide passage 32 which is parallel tothe axis of the drill and in which is slidably fitted a gage member 34.

The upper portion of the gage member 34 is provided ith a series ofteeth 36, spaced one-eighth of an inch apart, and indicia 38 areprovided on the face of the gage to denote which of the teeth 36 is tobe used when operating upon a heel of a given height.

Pivoted at 40 in the gage carrier is a hook 42 against the tail portionof which bears a spring 44 which tends at all times to press the hookinto engagement with one of the teeth 36.. The inner end of the spring44 is surrounded by a, cup 46 which presses against the flattened side48 of the gage, or the tops of the teeth 36, with enough pressure toproduce sutlicient friction to prevent the gage from dropping out of itscarrier when the hook 42 is released.

The lower end of the gage 34 is provided with a gaging surface 50adapted to engage the surface 22 of the work support. A. shoulder 52 isalso provided upon the gage and is designed for use in the operation ofsetting the drill in its holder.

The means provided for facilitating the setting of the drill in itsholder will now be described. Referring to Fig. 2 a fixture 54 isillustrated as secured immovably to a portion 56 of the frame of themachine by a set screw 58 although this detail is immaterial since themember 54 might equally well be an integral portion of the machineframe. A. vertical socket 60, inwhich the portion of the gage 34 belowthe shoulder 52 fits snugly, is formed in the fixture member 54, whichis provided with a horizontal fiat reference surface 62 adapted to beengaged by the shoulder 52 as shown.

In the member 54 there is also provided a vertical'passage, parallel tothe socket 60, in which is fitted a vertically adjustable anvil 64having a flat upper surface 66 which, when the anvil is in operativeposition, is horizontal and parallel to the surface 62.

A manually operable pin 68, movable in and out in the fixture element54, is adapted to enter selectively any one of a plurality of holes 70formed at different points in the height of the anvil 64, enabling theanvil to be secured in various adjusted positions in which its upperface 66 is at correspondingly different levels. The holes 70, inaddition to being at different heights, are distributed around thecircumference of the anvil and in alinement with each hole there isprovided an indicium 72 denoting the depth of the hole which will bedrilled in the work when the setting of the drill in the chuck 12 iseffected while the pin 68 is in the hole 70 corresponding to saidindicium. For example, when the anvil is set with the mark 38 facing theoperator, as shown in Fig. 2, and the drill is so adjusted in its holderthat its point rests upon the upper surface 66 of the anvil the drill isset to drill a hole three-eighths of an inch deep in the heel 20.

In addition to the numerical indicia 38 upon the face of the gage 34there is provided at 7 4 a letter S, designating one of the teeth 36which is to be engaged by the hook 42 when the drill is to be adjustedin its holder. In the device illustrated herein the tooth S istwo-eighths of an inch below the tooth 6 and therefore corresponds to agage setting of 48.- The length of the gage 34, from the the surface 62,and the anvil 64 set at 38,

the surface 50 of the lower end of the gage will be one-eighth of .aninch below the horizontal line XY which defines the level of the upperface 66 of the anvil the drill and gage being maintained perpendicularto the surfaces 62 and 66 by the close fit of the gage in the socket 60.It will be apparent that if the drill 14 is now so adjusted in the chuck12 that its point rests upon the anvil the point of the drill will beone-eighth of an inch above the lower end 50- of the gage, and that ifthis setting of the gage and drill is preserved a hole three-eighths ofan inch deep can be drilled in a 48 heel resting upon the work support22 before the feeding of the drill into the work is stopped byengagement of the gage with the surface of the work support.

If now it should be desired to drill a 88 hole in a heel of some otherheight, for example a 16-8 heel, it is only necessary to move the gage34 until the hook 42 engages the tooth 16. The gage will then engage thesurface of the work support and stop the feeding of the drill into thework when the drill has reached a point thirteen-eighths of an inchabove the work support and it will be easily seen that the required 38hole has been drilled into the heel. Similarly for a heel of any otherheight the gage is set by engaging the hook 42 with the corresponding lymarked tooth 36 and the desired depth of hole in the work will always beproduced regardless of the vertical position of the work support andentirely independently of the height of the last 24.

If a hole of another depth is desired in the work the drill is adjustedin its holder as above described but with the anvil 64 set to correspondto the depth of the hole which it is desired to drill.

In the ordinary use of the apparatus the drill will be set in the chuckto drill into the work to a depth of, say, one-half or five- ;eighths ofan inch and left that way indefinitely, the only change in adjustmentthat is required thereafter being to reset the gage 34 when a changeoccurs in the height of the heels being operated upon.

Having described the invention, what is claimed as new and desired to besecured by Letters Patent is 1. In a. machine having a rotating drillholder, the combination of a gage carrier having a clamp by which it maybe secured to the machine in fixed longitudinal relation to the drillholder, a depth gage member movable through said carrier in a directionparallel to the axis of the drill holder, spaced teeth upon the gagemember, and a hook upon the carrier arranged to engage any one of saidteeth to secure the gage in various definite positions relatively to thedrill holder.

2. In a machine having an upright drill holder, the combination, of agage carrier secured to the machine in fixed longitudinal relation tothe drill holder, a depth gage member movable through said carrier in adirection parallel to the axis of the drill holder, means for securingthe gage member in various definite positions of adjustment in thecarrier, and additional means for resisting movement of the gage memberthrough the carrier sufliciently to prevent said member from droppingwhen the securing means is released.

3. In a machine having an upright drill holder, the combination of anupright gage holder, a gage member adjustable vertically in said holder,and a continuously effective, yielding, friction device operatingautomatically upon the gage member with sufiicient force to prevent theweight of said member from causing it to move in its holder.

4. In a depth gage for drills, the combina u tion of a carrier, a gagemember slidable in said carrier, and a continuously effective, yielding,friction device opearting automatically to resist movement of the gagerelatively to the carrier.

5. In a depth gage for drills, the combination of a carrier, a toothedgage member slidable in said carrier, a hook arranged to engage theteeth on the gage member, and a friction device operating continuouslyindependently of said hook to resist movement of the gage memberrelatively to the carrier.

6. In a depth gage for drills, the combination of a carrier,a toothedgage member slidable in said carrier, a spring pressed hook arrangedtoengage the teeth on the gage member positively to lock said memberagainst movement relatively to the carrier, and a friction cupcontinuously pressed against the gage member by the same spring whichpresses said hook.

In testimony whereof I have signed my name to this specification.

FREDERIG E. BERTRAND.

